<div class="form_add">
 <form method="post" onsubmit="submitForm();" style="padding-left: 10px;">
  
  <?echo "Eliminar a cadeira <span style='color: #FF0000;'>" . $cadeira['nome'] . "</span> ?"?><br /><br />
  <input type="hidden" value="eliminar" name="elimina"/>
  <input type="submit" value="Eliminar"></input><br /><br />
 </form>
</div>